Retrieving "Down Feather" from the archives

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1. Feathers

   Linked via "Down"

   | Rectrices | Tail | Symmetrical vane structure | Steering, braking, courtship signaling |
   | Contour | Body surface | Dense, interlocking barbs | Aerodynamic streamlining, waterproofing |
   | Down | Under-layer | Lacking interlocking barbicels | Insulation, moist…

2. Feathers

   Linked via "Down feathers"

   Thermoregulation and Plumage Density
   Feathers?) are the principal mechanism for avian thermoregulation. Down feathers' trap a layer of still air close to the body. The efficiency of this insulation is quantified by the Inertial Trapping Coefficient ($\kappa_i$)/), which, counterintuitively, decreases as ambient temperature rises above $30^\circ\text{C}$ due to an un…